Refrigerator



FIG. 1 is a perspective view of a refrigerator showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a top plan view thereof where the bottom plan view is a mirror image.

The broken lines in the figure drawings show unclaimed environment only and form no part of the claimed design. 

CLAIM The ornamental design for a refrigerator, as shown and described. 